1 files changed, 39 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/msi.c b/arch/powerpc/kernel/msi.c
new file mode 100644
index 000000000..a5d25bebc
--- /dev/null
+++ b/arch/powerpc/kernel/msi.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/msi.h>
+#include <linux/pci.h>
+
+#include <asm/machdep.h>
+
+int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	if (!phb->controller_ops.setup_msi_irqs ||
+	    !phb->controller_ops.teardown_msi_irqs) {
+		pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
+		return -ENOSYS;
+	}
+
+	/* PowerPC doesn't support multiple MSI yet */
+	if (type == PCI_CAP_ID_MSI && nvec > 1)
+		return 1;
+
+	return phb->controller_ops.setup_msi_irqs(dev, nvec, type);
+}
+
+void arch_teardown_msi_irqs(struct pci_dev *dev)
+{
+	struct pci_controller *phb = pci_bus_to_host(dev->bus);
+
+	/*
+	 * We can be called even when arch_setup_msi_irqs() returns -ENOSYS,
+	 * so check the pointer again.
+	 */
+	if (phb->controller_ops.teardown_msi_irqs)
+		phb->controller_ops.teardown_msi_irqs(dev);
+}